25
24
+
+
Using , ,
keys set the lower
part to “
d 31
”.
Insert the previously prepared deionized water standard into the
cuvette holder and make sure that the notch on the cap is positioned
securely into the groove. Press the
key.
The display will blink “
-Lc-
” for
several seconds, indicating that
adjustment of the LED for the
colorimetric measurements is in
progress.
After this, a sequence of numbers between -511 to 512 will appear
on the upper LCD indicating the different levels of LED light intensity.
In approximately one minute, the adjustment will be made and the
calibration data will be stored in the non-volatile memory.
Display will show four dashes again
indicating the end of the zero
calibration procedure.
Press the
ALT
and
CAL
keys again
to leave the diagnostic mode.
Two-point customized calibration
To enter the colorimetric calibration mode, press momentarily both the
ALT
and
CAL
keys. The LCD will show four dashes and “
d00
”.
+
After the second calibration point is memorized, the unit will store the
calibration data together with time and date in the EEPROM while
intermittently indicating “
CAL
” and “
Stor
” for several seconds.
Subsequently, the upper display
will show “
----
”, indicating that
the meter is calibrated and ready
to measure turbidity of an unknown
sample.
By pressing
CAL
during calibration, user can quit the
calibration mode at any time without changing the
previously stored calibration data.
COLORIMETRIC CALIBRATION
Zero calibration
To calibrate the span of the meter, fill the cuvette with a clean
deionized water sample. Inspect and thoroughly clean the surface of
the vial.
Turn the meter on and press both
ALT
and
CAL
momentarily.
The display will show four dashes
and “
d 00
”. The second “
0
” will
blink to allow the user to make a
selection.
